Induced-draft apparatus.



No. 799,560. PATENTED SEPT. 12, 1905. R. W. HAMANN.

INDUCED DRAFT APPARATUS.

APPLICATION FILED JAN. a, 1904.

3 SHEETS--SHEBT l.

NO- 799,560. PATENTED SEPT. 12, 1905. R. W. HAMANN.

INDUCED DRAFT APPARATUS.

APPLIGATION FILED JAN. a. 1904.

3 sHEBTs-sHBET 2.

PATBNTED SEPT. 12, 19o-5.

R. W. HAMANN. INDUCED DRAFT APPARATUS.

APPLICATION FILED JAN. 8. 1904.

WW l law Nm f rhino UNITED STATES- PATENT OFFICE.

RICHARD' WV. HAMANN, OF ST. LOUIS, MISSOURI, ASSIGNOR TO EUGENE JQFEINER, OF ST. LOUIS, MISSOURI.

lNDUCED-DRAFT APPARATUS.

Speccaton of Letters Patent.

Patented Sept. 12, 1905.

Application iled Jauuaryi, 1904. Serial No. 188,260.

T (,LZZ 1072/0711/ t muy concern:

Be it known that I, RICHARD IN. HAMANN, a citizen ofthe United States, residing at St. Louis, State of Missouri,have invented certain new and useful Improvements in Induced- Draft Apparatus, of which the following is a specification containing a full, clear, and exact description, reference being had to the accom panying drawings, forming a part hereof.

My invention relates to induced-draft apparatus, my object vbeing to place a steamturbine blower in the wall of the furnace, so as to conduct the draft from the blower to the fire and discharge the exhaust from the turbine at a point to supplement the force of the air-draft.

My invention consists in the novel features hereinafter shown, described, and claimed.

In the drawings, Figure lis a horizontal section of the walls of a furnace, showing my induced-draft apparatus in position for use. Fig. 2 is a vertical section showing the details of construction of the turbine and fan upon an enlarged scale, said view being taken substantially on the line 2 2 of Fig. 3. Fig. 3 is an inside elevation as seen looking in the direction indicated by the arrow 3 in Fig. 2, parts being broken away and parts being shown in section. Fig. 4 is an outside elevation as seen looking in the direction indicated by the arrow 4 in Fig. 2, parts being broken' away and parts being shown in section to illustrate the details of construction.A Fig. 5 is an enlarged detail of the valves for controlling the steam-jets. Fig. 6 is a sectional View on the line 6 6 of Fig. 5.

Referring to the drawings in detail, the bridge-wall 7 connects the side walls 8 and 9 a suitable distance back of the front wall 10, l

as required, to form the ash-pit 11, and said walls 8 and 9 extend a considerable distance backwardly from the bridge-wall 7, the rear ends of said walls being connected by the wall 12. Said walls 7, 8, 9, 10, and 12 form the boiler-setting. An opening 13 is formed in the side wall 8 immediately back of the bridge-wall 7 and below the level of the gratesY to receive the draft apparatus.

A casing 1 4 is square in elevation, as shown in Figs. 3 and 4, and iits rigidly in the opening 13 of the wall 8. The hood 15 is funnelshaped and extends from the casing 14 and terminates in thev pipe-nipple 16. A flange 17 extends outwardly and forms a frame litting against the outer face of the wall 8,

, said flange serving to make a close joint The hlnge members around the casing 14. 18 are rigidly secured to the outer face of the wall 8 or to the flange 17 in any suitable way. The swinging hinge members 19 -are connected to the members 18 by the hinge-pins 20. The front plate 21 is connected to the swinging hinge members 19, said front plate being substantially the same size as the iange 17 and being in position to close the opening through the casing 14.

At the center of the plate 21 is an outwardly-projecting circular rim 22, forming the air-intake opening. The Aring 23 is secured to the rear face of the plate 21 by screws, rivets, or bolts 25, said ring beingv concentric to the air-intake opening. Arms 26 extend backwardly from said ring, said arms being equally spaced around the center.

-The supporting-plate 27 is rigidly connected to the rear ends of the arms 26, said plate being circular i`n form and somewhat larger than the ring 23.v The bushing 28 has a liange 29 secured to the front face of the plate 27,

rsaid bushing extending through the plate 27 and extending forwardly from the flange 29 a considerable distance. The shaft 30 is rotatably mounted in the bushing 28, and the turbine-Wheel 31 is fixed upon the rear end of said shaft. A fiange 32 extends backwardly from the edge of the plate 27, and the housing-plate 33 is connected to the rear edge of said flange, there being a vcap 34 extending backwardly from the center of said plate 33. to form a recess for the hub of the wheel 31, thus completely inclosing the turbine-wheel, the cup-shaped buckets 35 of said wheel litting closely within the ring 23. The bearingblock 37 extends upwardlyfrom the ring 23, v

said bearing-block being cored to form. the jet-plug chamber 38, which connects with the tu rbine-chamber 39.

The threejet-plugs 40 are mounted in bores 41, extending horizontally through the bearing-block 37and chamber 38, said plugs 40 having eccentric heads 42. Ports 43 extend into said plugs 40 from their forward ends and connect with the jets 44, said jets discharging into the turbine-chamber 39 and the angle of said jets relative to the buckets of the turbine being determined and adjusted by manipulating the heads 42, thus rotating the plugs, and when said jets have been properly adjusted set-screws 45 are inserted through the heads 42 into the plate 27 to hold the IOO plugs rigidly in position. The pipe-nipples 46 are tapped into the ports 43, and unions 47 are mounted upon the forward ends of said nipples. The ports 43 are formed in the plugs 40 to one side of the center, so as to give thick Walls in which to bore the jets 44 without correspondingly enlarging the plugs.

The forward end of the shaft 30 is reduced in size to form the shoulder 48, and the fanhub 49 is mounted upon the shaft against the shoulder 48 and clamped in position by the nut 50, screw-seated upon the shaft 30. The bearing -shell 51 extends backwardly from the hub 49, and a brass bushing 52, inserted rigidly into said shell, rotatably fits the bushing 28. The flange 53 extends outwardly from the rear end of the shell 51, and the fan-supporting disk 54 is rigidly connected to said flange 53. Blades 55 extend forwardly from the face of said disk 54, said blades being located radially equal distances apart, and the ring 56 connects the front ends of said blades.

The steam-supply pipe 57 isv connected to the elbow 58, and said elbow is connected to the upper hinge-pin 20. A pipe 59 leads from the elbow 58 to the globe-valve 60, and the globe-valves 61 62 are connected to the globe-valve 60. Pipes 63 connect the globevalves 61 62 to the unions 47, so that said globe-valves control the jets 44 each independent of the others.

The T 64 is located in vertical alinement with the hinge-pins 20. The exhaust-pipe 65 leads from the lower part of the turbine-chamber tothe elbow 66, and said elbow 66 is connected to the T 64 by the union 67. A pipe 68 leads from the T 64 through the wall 8, said pipe being controlled by the valve 69, and a pipe 70 leads from the other end of the T 64 to any suitable place, said pipe being controlled lby the valve 71. rIhe entire mechanism is mounted upon the plate 21, said plate being mounted upon the hinges turning upon the pins 20, so that the plate 21,

swings like a door to open and close the passage through the casing 14, the exhaust-pipe turning at the union 67 and the supply-pipe turning at its connection between the pipe 57 and elbow 58. Y

If the valves 60 61 62 are opened, steam will pass through the pipe 63 and be discharged through the fine jet-holes 44 and strike the buckets 35 and rotate the turbine-wheel at a high rate of speed. This will rotate the fanwheel, thereby drawing the air through the air-intake opening 22 and by centrifugal force compressing the air in the casing 14 around the fan-wheel, and this will force the air backwardly through the opening 72 between the ring 23 and the casing 14, and the air strikes the funnel-shaped hood 15 and is conducted to the pipe-nipple 16, and from said pipe-nipple 16 the pipe 73 leads through the wall 7, thus discharging the air into the ash-pit below the g'rate. rlhe discharge end of the pipe 73 is at the center of the bridge-wall, so that the air may spread equally in both directions.

The exhaust-pipe 68 leads under the airpipe 73 through the bridge-wall 7 and the perforated distributingpipe 74, said distributing-pipe being located in front of the bridgewall and the jet-holes of the pipe discharging upwardly, so that the exhaust-steam reinforces the air-draft.

By using the small jet-holes 44 I secure steam-jets of great velocity and small volume, and by having a plurality of independeutcu tos 60 61 62 I may cut off one or more of the iets without reducing the pressure and velocity ofthe remaining jet or jets.

I wish to call especial attention to the importance of having the fan-chamber open all the way around its periphery, thus rendering it unnecessary to carry the air around to a certain place, as in the old form of fan-chambers, but allowing' the fan to discharge at all points of the periphery, thus greatly decreasing the resistance of the air and correspond- Y ingly reducing the power required to run the fan.

I claim- 1. In an induced-draft apparatus: the combination with a furnace having a bridge-wall, of a blower; a pipe leading from the blower through the bridge-wall; a turbine for operating the blower, an exhaust-pipe leading from the turbine forwardly through the bridgewall; and a perforated distributing-pipe connected to the forward end of the exhaust-pipe parallel with and in front of the bridge-wall; substantially as specified.

2. In an induced-draft apparatus, the combination with a furnace having' a bridge-wall, of a casing mounted in the outside wall of the furnace, a front plate hinged to the wall and adapted to close the casing, and having a centrally-arranged air-intake opening, arms eX- tending inwardly from the front plate, animpact-engine mounted upon the inner ends of the arms, a casing around said engine, there being an air-space around said engine, a blower mounted upon the shaft of the engine in front of the engine-casing, a steam-pipe leading' to the engine, an exhaust-pipe leading from the engine, which pipes are so hinged as that the blower apparatus may be swung into and out of the casing, and a perforated distributing-pipe connected to the forward end of the exhaust-pipe parallel with and in front of the bridge-wall; substantially as specified.

In testimony whereof I have signed my name to this specification in presence of two subscribing witnesses.

RICHARD W. HAMANN.

Witnesses:

ALFRED A. Eioiis, M. G. IRION.

IOO 

